DK156702C - Process for reducing the ozone formed by welding or machining by means of an electric arc - Google Patents
Process for reducing the ozone formed by welding or machining by means of an electric arc Download PDFInfo
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- DK156702C DK156702C DK492577AA DK492577A DK156702C DK 156702 C DK156702 C DK 156702C DK 492577A A DK492577A A DK 492577AA DK 492577 A DK492577 A DK 492577A DK 156702 C DK156702 C DK 156702C
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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- Arc Welding In General (AREA)
- Oxygen, Ozone, And Oxides In General (AREA)
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Description
iin
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Den foreliggende opfindelse angår en fremgangsmåde til reduktion af det ved svejsning eller bearbejdning ved hjælp af en elektrisk lysbue dannede ozon, hvor svejsningen eller bearbejdningen udføres under beskyttelsesgas, og et tilsat stof i det væsentlige synkront med svejse- eller bearbejdningsprocessen indføres i umiddelbar nærhed af lysbuen og bringes til at reagere med det ozon, der som følge af ultraviolet bestråling er dannet af oxygenet i umiddelbar nærhed af lysbuen.The present invention relates to a method for reducing the ozone created by welding or machining by means of an electric arc, wherein the welding or machining is performed under protective gas, and an added substance substantially synchronous with the welding or machining process is introduced in the immediate vicinity of the arc. and is reacted with the ozone formed by the ultraviolet radiation formed by the oxygen in the immediate vicinity of the arc.
Ozon er som bekendt en meget giftig luftart. I de fleste lande ligger den højst tilladte ozonkoncentration på arbejdspladser mellem 0,000005 og 0,00001%. Ozon kan dannes af luftens oxygen ved forskellige reaktioner, først og fremmest ved fotokemisk reaktion med ultraviolet (UV) bestråling. Ved anvendelse af en åben elektrisk lysbue til svejsning, skæring eller lignende er den UV-bestråling, der dannes, tilstrækkelig stærk til at bevirke dannelse af målelige mængder ozon både i umiddelbar nærhed af lysbuen og i omgivelserne.Ozone is, as you know, a very toxic gas. In most countries, the maximum permitted ozone concentration in workplaces is between 0.000005 and 0.00001%. Ozone can be generated by the oxygen of the air in various reactions, first and foremost by photochemical reaction with ultraviolet (UV) radiation. By using an open electric arc for welding, cutting or the like, the UV radiation generated is sufficiently strong to cause the formation of measurable amounts of ozone both in the immediate vicinity of the arc and in the surroundings.
Normalt opstår ozon fotokemisk ved dissociationen af oxygenmolekyler i overensstemmelse med følgende reaktionsligning: 02 + (hu) -»0 + 0 og 02 + 0 -» 03, hvor h = er Plancks konstant og υ = UV-strålingens frekvens.Normally, ozone is created photochemically by the dissociation of oxygen molecules according to the following reaction equation: 02 + (hu) - »0 + 0 and 02 + 0 -» 03, where h = is Planck's constant and υ = the frequency of the UV radiation.
Oxygenmolekylers dissociationsenergi ligger ved 5 eV, og som følge heraf deltager kun stråling med en bølgelængde, der er mindre end ca. 220 nm, i den fotokemiske frembringelse af ozonen. Den maksimale dissociation af oxygen finder sted ved bølgelængder i området fra 130 til 180 nm. UV-strålingen med denne bølgelængde absorberes praktisk taget fuldstændigt af dissociationsprocessen i luften indenfor en strækning på få millimeter eller centimeter. På grund af disse forhold frembringes den største koncentration af ozon umiddelbart i nærheden af lysbuen og dermed i arbejderens åndingszone. Erfaringer har vist, at den frembragte ozonmængde afhænger af den anvendte svejsefremgangsmåde, svejseparametrene som f.eks. buelængde, svejsehastighed og arten af den anvendte beskyttelsesgas, samt af det materiale, hvoraf det bearbejdede emne består. Ikke sjældent dannes der fuldstændigt uantagelige koncentrationer af ozon, hvilket nødvendiggør bestemte modforanstaltninger. En sædvanlig løsning af dette problem består i at fortynde ozonen ved hjælp af ventilation enten ved udvalgte steder eller i hele 2The dissociation energy of oxygen molecules is at 5 eV, and as a result, only radiation with a wavelength less than approx. 220 nm, in the photochemical generation of the ozone. The maximum dissociation of oxygen takes place at wavelengths in the range of 130 to 180 nm. The UV radiation of this wavelength is almost completely absorbed by the dissociation process in the air within a few millimeters or centimeters. Because of these conditions, the highest concentration of ozone is produced immediately near the arc and thus in the worker's breathing zone. Experience has shown that the amount of ozone produced depends on the welding method used, the welding parameters such as e.g. arc length, welding speed and the nature of the protective gas used, as well as the material of the machined workpiece. It is not uncommon for completely unacceptable concentrations of ozone to form, which requires certain countermeasures. A usual solution to this problem is to dilute the ozone by means of ventilation either at selected locations or throughout 2
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opholdsområdet. Sådanne løsninger har imidlertid vist sig at være utilstrækkelige og besværlige. Ved en ventilation ved enkelte steder er det for overhovedet at opnå en virkning nødvendigt at tilføre relativt store luftmængder, der strømmer med forholdsvis stor hastighed. En sådan løsning forstyrrer svejseprocessen, navnlig når denne udføres i en beskyttelsesgasatmosfære. En yderligere ulempe ved ventilationen består i, at den er vanskelig at tilpasse ved ændrede arbejdsbetingelser. Ofte forårsager svage ventilationer i forbindelse med træk en farlig koncentration i arbejderens åndingszone, der ikke ville fremkomme helt uden ventilation.the seating area. However, such solutions have proved inadequate and cumbersome. In case of ventilation at individual locations, it is necessary to supply a relatively large amount of air flowing at a relatively high velocity at all to obtain an effect. Such a solution interferes with the welding process, especially when it is carried out in a protective gas atmosphere. A further disadvantage of ventilation is that it is difficult to adapt to changing working conditions. Often, weak ventilation associated with traits causes a dangerous concentration in the worker's breathing zone that would not appear completely without ventilation.
Fjernelsen af luft fra svejsezonen ved hjælp af udsugning til fjerntliggende steder er også forbundet med ulemper i visse henseender. Også i dette tilfælde bør svejseprocessen ikke forstyrres. Dette gælder navnlig ved svejsning med beskyttelsesatmosfære. Desuden virker udsugningen generende, hvad angår bevægelsen af brænderen, hvilket navnlig er uheldigt ved manuel svejsning. Udsugningen fører endvidere til yderligere tekniske problemer. En yderligere følge af anvendelsen af luftudsugningen til fjerntliggende steder viser sig ved svejsning med nedsmeltelige elektroder eller beklædte elektroder. Ved sådanne fremgangsmåder er ozonkoncentrationen noget ringere sammenlignet med de svejsefremgangsmåder, ved hvilke der anvendes ikke-nedsmeltelige elektroder. En grund til denne mindre ozonkoncentration er den beskyttelsesvirkning overfor ozondannelse, der optræder som følge af røgdannelsen. Røgen absorberer nemlig UV-stråling, der ellers ville frembringe ozon. Desuden forringes ozonkoncentrationen kemisk på grund af røgens smådele. Ved fjernelse af røgen går denne beskyttelsesvirkning, hvad angår ozon, tabt.The removal of air from the welding zone by means of extraction to remote locations is also associated with disadvantages in some respects. In this case too, the welding process should not be disturbed. This is especially true when welding with a protective atmosphere. In addition, the extraction is bothersome as regards the movement of the burner, which is particularly unfortunate in manual welding. The extraction also leads to further technical problems. A further consequence of the application of air extraction to remote locations is shown by welding with meltable electrodes or coated electrodes. In such methods, the ozone concentration is somewhat inferior compared to the welding methods using non-digestible electrodes. One reason for this lower ozone concentration is the protective effect of ozone formation that results from the formation of smoke. The smoke absorbs UV radiation that would otherwise produce ozone. Furthermore, the ozone concentration is chemically degraded due to the small parts of the smoke. When the smoke is removed, this protective effect with regard to ozone is lost.
Foruden rekombinationen af ozon svarende til de følgende formler: 03 + (hu) -* 02 + 0 og 03 + O 4 2 02 kan der finde en reaktion sted mellem ozon og nitrogenoxider svarende til de følgende formler: NO + 03 - N02 + 02 N02 + 0 - NO + 02.In addition to the recombination of ozone corresponding to the following formulas: 03 + (hu) - * 02 + 0 and 03 + O 4 2 02, a reaction can take place between ozone and nitrogen oxides corresponding to the following formulas: NO + 03 - NO2 + 02 N02 + 0 - NO + 02.
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Slutresultatet af disse reaktioner er rekombinationen af ozon til oxygen: 03 + 0 -♦ 2 02.The end result of these reactions is the recombination of ozone to oxygen: 03 + 0 - ♦ 2 02.
Denne reaktion vil kunne anvendes til formindskelse af uønsket dannet ozon. Heri består den foreliggende opfindelses genstand.This reaction could be used to reduce undesired ozone. Herein, the object of the present invention consists.
Fra det tyske fremlæggelsesskrift nr. 10 39 675 kendes en lysbuesvejsefremgangsmåde under beskyttelsesgas, hvor der som beskyttelsesgas tilføres carbondioxid i en indre ringstrøm, og en anden gas eller gasblanding tilføres i en koncentrisk ydre ringstrøm, og hvor den ydre ringstrøm til oxidation af restbestanddelen af carbonmonooxid på i og for sig kendt måde består af en oxiderende gas eller gasblanding.German Patent Specification No. 10 39 675 discloses an arc welding process under protective gas, in which carbon dioxide is supplied in an inner ring stream as a protective gas and another gas or gas mixture is supplied in a concentric outer ring stream and the outer ring stream for oxidation of the residual carbon monoxide component. known per se consists of an oxidizing gas or gas mixture.
Fra skriftet Deutscher Verband fur Schweisstechnik (DVS), bind 37, 1975, Dusseldorf, "Physik og Technologie des Plasmastrahls in der Schneid- und Spritztechnik", side 65-71 er det kendt, at der ved plasmaskæring dannes nitrogenoxider og ozon, hvor 03 reagerer med NO og omsættes til N02 og 02, således at der fås en meget lille ozonkoncentration.From the paper Deutscher Verband fur Schweisstechnik (DVS), Volume 37, 1975, Dusseldorf, "Physics and Technology of Plasmastrahls in der Schneid- und Spritztechnik", pages 65-71, it is known that nitrogen oxides and ozone are formed during plasma cutting, where 03 react with NO and react to NO 2 and O 2 to give a very low ozone concentration.
Formålet med den foreliggende opfindelse er at forbedre den indledningsvis nævnte fremgangsmåde på en sådan måde, at risikoen for dannelse af det for personen, der udfører svejsningen eller bearbejdningen, farlige ozon formindskes, uden at svejse- eller bearbejdningsprocessen forringes, eller at der opstår andre sundhedsfarer.The object of the present invention is to improve the process mentioned above in such a way as to reduce the risk of forming that of the person performing the welding or machining, dangerous ozone, without impairing the welding or machining process or causing other health hazards. .
Denne opgave løses ifølge opfindelsen ved en fremgangsmåde af den indledningsvis nævnte art med de i krav l's kendetegnende del angivne ejendommeligheder.This object is solved according to the invention by a method of the kind mentioned initially with the characteristics specified in the characterizing part of claim 1.
På denne måde kan den ozon, der dannes ved arbejde med en åben lysbue, formindskes, uden at dette har nogen uheldig indflydelse på svejseoperationen eller lignende, og uden at arbejderen påvirkes på uheldig måde af nitrogenoxid, idet den ozon, der dannes i den luft, der omgiver lysbuen, ved UV-stråling bringes til at reagere katalytisk med nitrogenoxid. Herunder kan nitrogenoxidet dannes ved kemisk reaktion eller termisk eller fotokemisk spaltning af dertil egnede stoffer eller forbindelser i en konverter der er forbundet med gastilførselsledningen.In this way, the ozone created by working with an open arc can be reduced without adversely affecting the welding operation or the like, and without the worker being adversely affected by nitric oxide, the ozone formed in that air , which surround the arc, by UV radiation is caused to react catalytically with nitric oxide. Below, the nitric oxide may be formed by chemical reaction or thermal or photochemical cleavage of suitable substances or compounds in a converter connected to the gas supply line.
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Nitrogenoxidet medfører ikke nogen uheldige forhold, hvad angår selve svejseprocessen og dennes omgivelser, i den ifølge opfindelsen foreslåede koncentration og kan overhovedet kun konstateres i ubetydelig grad.The nitric oxide does not cause any adverse conditions as to the welding process itself and its surroundings, in the concentration proposed according to the invention and can only be found to a negligible degree.
Fremgangsmåden til formindskelse eller fjernelse af ozondannelse ifølge opfindelsen kan gennemføres med forskellige indretninger i afhængighed af den valgte svejsemetode eller af andre omstændigheder i forbindelse med arbejdsprocessen. Typiske løsninger til udøvelse af fremgangsmåden ifølge opfindelsen vil blive beskrevet i forbindelse med nogle eksempler, og derved vil opfindelsen også blive nærmere forklaret.The process of reducing or removing ozone formation according to the invention can be carried out with various devices depending on the welding method chosen or other circumstances related to the working process. Typical solutions for practicing the method of the invention will be described in connection with some examples, and the invention will also be further explained.
Allerede ud fra den ovenfor anførte korte karakteristik af opfindelsen er det klart, at fremgangsmåden til formindskelse eller fjernelse af ozondannelse ifølge opfindelsen ikke er behæftet med de mangler, som findes ved de hidtil kendte fremgangsmåder.From the brief character of the invention mentioned above, it is clear that the process for reducing or removing ozone formation according to the invention is not beset with the deficiencies found in the known methods.
Opfindelsen vil i det følgende blive nærmere forklaret under henvisning til tegning, der skematisk viser et til gennemførelse af fremgangsmåden ifølge opfindelsen egnet apparat.The invention will be explained in more detail below with reference to the drawing which schematically shows an apparatus suitable for carrying out the method according to the invention.
Fremgangsmådens princip forklares først ved afpasning af opfindelsen til lysbuesvejsning under beskyttelsesgas. Ved beskyttelsesgassvejsning med intert gas anvendes enten ikke-afsmeltende wolframelektroder (TIG) eller afsmeltende elektroder (MIG). I sidstnævnte tilfælde er det undertiden fordelagtigt også at anvende aktiv gas (MAG). Selvom opfindelsens tilpasning vil blive beskrevet i forbindelse med TIG-svejsning, er det indlysende for en fagmand, at den også kan tilpasses MIG- og MAG-svejsning.The principle of the method is first explained by adapting the invention to arc welding under protective gas. For internal gas shielding gas welding, either non-melting tungsten electrodes (TIG) or melting electrodes (MIG) are used. In the latter case, it is sometimes advantageous to use active gas (MAG) as well. Although the adaptation of the invention will be described in connection with TIG welding, it is obvious to one skilled in the art that it can also be adapted to MIG and MAG welding.
På tegningen indeholder en gasbeholder 1 inert gas eller en blanding af inerte gasser. En gasbeholder 2 indeholder nitrogenoxid (NO), som ifølge opfindelsen bringes til reaktion med ozon i lysbuens nærhed. Nitrogenoxidet ledes til en reguleringsindretning 3, som kan anbringes f.eks. i strømkilden 4. Regulerings indretningen 3 blander nitrogenoxidet med beskyttelsesgassen til en ønsket koncentration. Den færdige blanding ledes til en brænder 6, og gennem denne strømmer gassen mod et arbejdsstykke 5 og i retning af pile 8 i brænderens nærhed. Lysbuen, der brænder mellem brænderens elektrode og arbejdsstykket 5, frembringer ozon i brænderens nærhed ved UV-bestråling af luften. Det bestrålede område 10 ses med stiplede linier. Ud over bestråling sker der i reglen en vis opvarmning af luften i dette område, hvorved luften stiger opad ind i svejserens 5In the drawing, a gas container contains 1 inert gas or a mixture of inert gases. A gas container 2 contains nitric oxide (NO), which according to the invention is reacted with ozone in the vicinity of the arc. The nitric oxide is passed to a control device 3 which can be mounted e.g. in the power source 4. The control device 3 mixes the nitric oxide with the protective gas to a desired concentration. The finished mixture is passed to a burner 6, through which the gas flows towards a workpiece 5 and in the direction of arrows 8 in the vicinity of the burner. The arc burning between the burner electrode and the workpiece 5 produces ozone in the vicinity of the burner by UV irradiation of the air. The irradiated region 10 is shown in dotted lines. In addition to radiation, there is usually some heating of the air in this area, whereby the air rises upwards into the welder 5
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åndingszone bagved en svejseskærm 7. Under sædvanlige forhold kan svejseren altså indånde luft med forholdsvis højt ozonindhold. Når beskyttelsesgassen nu ifølge opfindelsen blandes med nitrogenoxid, strømmer dette nitrogenoxid sammen med inert gas ud til brænderens omgivelser. Derved bringes nitrogenoxidet til reaktion med ozon ifølge de tidligere nævnte eller lignende reaktioner. Dette bevirker reduktion eller eventuelt fjernelse af ozonen i den luftstrøm, der stiger opad og ind i svejserens indåndingszone.breathing zone behind a welding shield 7. Under normal conditions, the welder can therefore breathe air with relatively high ozone content. When the protective gas according to the invention is now mixed with nitric oxide, this nitric oxide, together with inert gas, flows out to the burner environment. Thereby the nitric oxide is reacted with ozone according to the aforementioned or similar reactions. This causes reduction or possibly removal of the ozone in the air flow rising upwards and into the welder's inhalation zone.
Praktiske forsøg er blevet udført med argon som beskyttelsesgas og med en strømningshastighed på 10 1 pr. min. Tilsætninger på kun 0,0025-0,005% nitrogenoxid til argon førte i de fleste tilfælde til en væsentlig formindskelse af ozonens koncentration i brænderens nærhed. For at eliminere ozonen helt, også under meget ugunstige omstændigheder, såsom stor svejsestrøm, lang lysbue og aluminium som svejsegods, var det tilstrækkeligt med en nitrogen-oxidtilsætningskoncentration på 0,025-0,075%.Practical experiments have been carried out with argon as a protective gas and at a flow rate of 10 liters per minute. mine. Additions of only 0.0025-0.005% nitric oxide to argon in most cases significantly reduced the concentration of ozone in the vicinity of the burner. In order to eliminate the ozone completely, even in very unfavorable circumstances such as large welding current, long arc and aluminum as welding material, a nitrogen oxide addition concentration of 0.025-0.075% was sufficient.
Fremgangsmåden til reduktion af ozondannelsen ved nitrogen-oxidtilsætning til beskyttelsesgas ifølge opfindelsen kan også anvendes ved brug af helium eller af kendte heliumblandinger, f.eks. med argon som beskyttelsesgas. Forsøg har vist, at det endog her i gunstige tilfælde er tilstrækkeligt med 0,0025-0,005% nitrogenoxid-tilsætning for at opnå en væsentlig ozonformindskelse og i ugunstige tilfælde med 0,025-0,075% for at opnå fuldstændig ozonfjernelse. Hvad der blev anført om helium og heliumblandinger i forbindelse med opfindelsens anvendelse gælder også for kendte blandinger af argon, hydrogen og nitrogen, som anvendes ved TIG-svejsning.The process of reducing the ozone formation by addition of nitrogen oxide to protective gas according to the invention can also be used with the use of helium or of known helium mixtures, e.g. with argon as protective gas. Studies have shown that even in favorable cases, 0.0025-0.005% nitric oxide addition is sufficient to achieve a significant ozone reduction and, in adverse cases, 0.025-0.075% to achieve complete ozone removal. What was stated about helium and helium mixtures in connection with the use of the invention also applies to known mixtures of argon, hydrogen and nitrogen used in TIG welding.
I det på tegningen viste eksempel på opfindelsens anvendelse findes der to gasbeholdere, en til beskyttelsesgas og en til nitrogenoxid til beskyttelsesgassen. Begge gasserne blandes i reguleringsindretningen 4. Fra opfindelsens forklaring er det klart, at opfindelsens karakter ikke ændres, om der i stedet anvendes kun én gasbeholder, der indeholder en færdig blanding af beskyttelsesgas og nitrogenoxid.In the example shown in the drawing of the application of the invention there are two gas containers, one for protective gas and one for nitric oxide for the protective gas. Both gases are mixed in the control device 4. From the explanation of the invention it is clear that the nature of the invention does not change if only one gas container is used which contains a finished mixture of protective gas and nitric oxide.
Hidtil er opfindelsens princip og anvendelse kun forklaret i forbindelse med TIG-svejsning. For en fagmand er det imidletid åbenbart let at anvende opfindelsen også til såkaldt plasmasvejsning eller plasmaskæring.So far, the principle and application of the invention have been explained only in connection with TIG welding. However, for one skilled in the art, it is evidently easy to apply the invention to so-called plasma welding or plasma cutting.
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7612355 | 1976-11-05 | ||
| SE7612355A SE403726B (en) | 1976-11-05 | 1976-11-05 | METHODS AND DEVICE FOR REDUCING OZONE FORMATION BY WELDING OR PROCESSING BY ELECTRIC LIGHT BAKING |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK492577A DK492577A (en) | 1978-05-06 |
| DK156702B DK156702B (en) | 1989-09-25 |
| DK156702C true DK156702C (en) | 1996-06-24 |
Family
ID=20329346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK492577AA DK156702C (en) | 1976-11-05 | 1977-11-04 | Process for reducing the ozone formed by welding or machining by means of an electric arc |
Country Status (21)
| Country | Link |
|---|---|
| US (1) | US4292493A (en) |
| JP (1) | JPS6051949B2 (en) |
| AR (1) | AR215656A1 (en) |
| AT (1) | AT385702B (en) |
| AU (2) | AU515836B2 (en) |
| BE (1) | BE860516A (en) |
| BR (1) | BR7707459A (en) |
| CA (1) | CA1123062A (en) |
| CH (1) | CH634498A5 (en) |
| DE (1) | DE2748417C2 (en) |
| DK (1) | DK156702C (en) |
| ES (1) | ES463903A1 (en) |
| FI (1) | FI67189C (en) |
| FR (1) | FR2369900A1 (en) |
| GB (1) | GB1594985A (en) |
| GR (1) | GR63997B (en) |
| MX (1) | MX4519E (en) |
| NL (1) | NL184202C (en) |
| NO (1) | NO151923C (en) |
| NZ (1) | NZ185614A (en) |
| SE (1) | SE403726B (en) |
Families Citing this family (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2854897C2 (en) * | 1978-12-19 | 1982-05-06 | Bundesrepublik Deutschland, vertreten durch den Bundesminister für Wirtschaft in Bonn, dieser vertreten durch den Präsidenten der Bundesanstalt für Materialprüfung (BAM), 1000 Berlin | Process for reducing the ozone generated during gas-shielded arc welding |
| GB2049638B (en) * | 1979-05-31 | 1982-09-08 | Air Prod & Chem | Weld shielding gas mixtures |
| SE465757B (en) * | 1990-03-14 | 1991-10-28 | Aga Ab | PROCEDURE FOR PREPARING A PROTECTIVE GAS CONTAINING NITROGEN MONOXIDE AND GAS MIXING FOR PREPARATION OF THE PROTECTIVE GAS |
| DE4028074C1 (en) * | 1990-09-05 | 1992-01-23 | Messer Griesheim Gmbh, 6000 Frankfurt, De | |
| US5558791A (en) * | 1992-12-12 | 1996-09-24 | Messer Griesheim | Inert gas for the arc welding of aluminum |
| US5609783A (en) * | 1992-12-12 | 1997-03-11 | Messer Griesheim Gmbh | Inert gas for the arc welding of aluminum |
| DE4241982C1 (en) * | 1992-12-12 | 1993-11-25 | Messer Griesheim Gmbh | Shielding gas for the arc welding of aluminum |
| DE4241983C1 (en) * | 1992-12-12 | 1994-03-24 | Messer Griesheim Gmbh | Shielding gas for the arc welding of aluminum |
| FR2747064B1 (en) * | 1996-04-03 | 1998-05-15 | Air Liquide | METHOD AND DEVICE FOR REDUCING OZONE EMISSIONS PRODUCED DURING A PROTECTIVE GAS ARC WELDING OPERATION |
| AU7556898A (en) * | 1997-05-06 | 1998-11-27 | David Royd O'neill | Gas mixtures for arc welding affecting weld characteristics |
| DE19831831A1 (en) * | 1998-04-08 | 1999-10-14 | Linde Ag | Shielding gas for TIG direct current welding of aluminum |
| DE19831834A1 (en) * | 1998-04-08 | 1999-10-14 | Linde Ag | Shielding gas for MIG / MAG welding of aluminum |
| DE19831832A1 (en) * | 1998-04-08 | 1999-10-14 | Linde Ag | Shielding gas for TIG AC welding of aluminum |
| US6504308B1 (en) | 1998-10-16 | 2003-01-07 | Kronos Air Technologies, Inc. | Electrostatic fluid accelerator |
| DE10162938A1 (en) | 2001-12-20 | 2003-07-03 | Linde Ag | Process for the preparation of a protective gas mixture |
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| DE1039675B (en) * | 1957-07-20 | 1958-09-25 | Agil Schweissdraht Dr Vaas G M | Inert gas arc welding process with carbon dioxide in the inner ring flow and with an outer ring flow |
| DE1215835B (en) * | 1963-11-08 | 1966-05-05 | Linde Ag | Process for inert gas arc welding of work pieces made of unalloyed bulk steel |
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| US1746209A (en) * | 1925-10-07 | 1930-02-04 | Gen Electric | Method and apparatus for electric-arc welding |
| US2497631A (en) * | 1948-05-14 | 1950-02-14 | Air Reduction | Arc welding |
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| US2688097A (en) * | 1952-03-25 | 1954-08-31 | Friedman Herbert | Nitric oxide counter |
| FR1132997A (en) * | 1954-06-30 | 1957-03-19 | Kaiser Aluminium Chem Corp | Arc welding in inert gas atmosphere |
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| US3133348A (en) * | 1961-11-21 | 1964-05-19 | Coast Metals Inc | Method of welding or brazing |
| DE1190597B (en) * | 1962-08-07 | 1965-04-08 | Kurt Beyersdorfer Dr Ing | Process for electrofusion of metals |
| NL297911A (en) * | 1963-09-13 | |||
| GB1045620A (en) * | 1963-10-15 | 1966-10-12 | British Oxygen Co Ltd | Improvements in and relating to gas shielded arc welding processes |
| CH408230A (en) * | 1964-05-11 | 1966-02-28 | Secheron Atel | Welding process of thin sheets, using an electric arc |
| US4095080A (en) * | 1976-01-07 | 1978-06-13 | Osaka Denki Co., Ltd. | Method for measuring the extent of shielding function of an arc atmosphere and an arc welding machine including a nitrogen oxide measuring device measuring the extent of shielding function |
-
1976
- 1976-11-05 SE SE7612355A patent/SE403726B/en unknown
-
1977
- 1977-09-04 MX MX776523U patent/MX4519E/en unknown
- 1977-10-27 AU AU30117/77A patent/AU515836B2/en not_active Expired
- 1977-10-27 AU AU30117/77A patent/AU3011777A/en active Granted
- 1977-10-28 DE DE2748417A patent/DE2748417C2/en not_active Expired
- 1977-11-03 FI FI773301A patent/FI67189C/en not_active IP Right Cessation
- 1977-11-04 NO NO773797A patent/NO151923C/en unknown
- 1977-11-04 BE BE182376A patent/BE860516A/en not_active IP Right Cessation
- 1977-11-04 DK DK492577AA patent/DK156702C/en not_active IP Right Cessation
- 1977-11-04 CA CA290,191A patent/CA1123062A/en not_active Expired
- 1977-11-04 NL NLAANVRAGE7712187,A patent/NL184202C/en not_active IP Right Cessation
- 1977-11-04 JP JP52132977A patent/JPS6051949B2/en not_active Expired
- 1977-11-04 AR AR269847A patent/AR215656A1/en active
- 1977-11-04 AT AT0790577A patent/AT385702B/en not_active IP Right Cessation
- 1977-11-04 FR FR7733218A patent/FR2369900A1/en active Granted
- 1977-11-04 NZ NZ185614A patent/NZ185614A/en unknown
- 1977-11-04 CH CH1345377A patent/CH634498A5/en not_active IP Right Cessation
- 1977-11-05 ES ES463903A patent/ES463903A1/en not_active Expired
- 1977-11-05 GB GB43858/77A patent/GB1594985A/en not_active Expired
- 1977-11-05 GR GR54717A patent/GR63997B/en unknown
- 1977-11-07 BR BR7707459A patent/BR7707459A/en unknown
-
1979
- 1979-07-05 US US06/054,923 patent/US4292493A/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE496337C (en) * | 1926-06-25 | 1930-04-17 | Aeg | Process for melting metals in an electric arc with a protective atmosphere |
| DE1016865B (en) * | 1954-06-30 | 1957-10-03 | Kaiser Aluminium Chem Corp | Process and device for inert gas arc welding of light metals with consumable and non-consumable electrodes |
| DE1039675B (en) * | 1957-07-20 | 1958-09-25 | Agil Schweissdraht Dr Vaas G M | Inert gas arc welding process with carbon dioxide in the inner ring flow and with an outer ring flow |
| DE1215835B (en) * | 1963-11-08 | 1966-05-05 | Linde Ag | Process for inert gas arc welding of work pieces made of unalloyed bulk steel |
Also Published As
| Publication number | Publication date |
|---|---|
| NO151923B (en) | 1985-03-25 |
| GR63997B (en) | 1980-01-18 |
| NL184202C (en) | 1993-12-16 |
| MX4519E (en) | 1982-06-02 |
| BE860516A (en) | 1978-03-01 |
| DK156702B (en) | 1989-09-25 |
| JPS5360346A (en) | 1978-05-30 |
| DK492577A (en) | 1978-05-06 |
| FI67189C (en) | 1985-02-11 |
| AU515836B2 (en) | 1981-05-07 |
| NO151923C (en) | 1985-07-03 |
| SE403726B (en) | 1978-09-04 |
| DE2748417A1 (en) | 1978-05-11 |
| AT385702B (en) | 1988-05-10 |
| AU3011777A (en) | 1979-05-03 |
| FR2369900B1 (en) | 1983-03-04 |
| FI67189B (en) | 1984-10-31 |
| NZ185614A (en) | 1980-02-21 |
| CH634498A5 (en) | 1983-02-15 |
| BR7707459A (en) | 1978-11-21 |
| NL184202B (en) | 1988-12-16 |
| ATA790577A (en) | 1981-07-15 |
| JPS6051949B2 (en) | 1985-11-16 |
| NO773797L (en) | 1978-05-08 |
| ES463903A1 (en) | 1978-07-01 |
| CA1123062A (en) | 1982-05-04 |
| DE2748417C2 (en) | 1983-06-09 |
| GB1594985A (en) | 1981-08-05 |
| FI773301A (en) | 1978-05-06 |
| SE7612355L (en) | 1978-05-06 |
| FR2369900A1 (en) | 1978-06-02 |
| AR215656A1 (en) | 1979-10-31 |
| US4292493A (en) | 1981-09-29 |
| NL7712187A (en) | 1978-05-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUP | Patent expired |